code: def get_scheme(address: str) -> str:
      if "://" not in address:
          scheme = None
      else:
          scheme = urlparse(address).scheme
      return scheme
  
file_path: mars/mars/oscar/backends/communication/core.py
imports: from typing import Dict, Type
  from urllib.parse import urlparse
  from .base import Client, Server
label_desc: Use image node_id 4 for calling a global function with example usage: get_scheme(address) and returns: scheme